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Question
HOW TO CALCULATE THE BREAKING CAPACITY(LIKE 15KA,20KA) OF 
CIRCUTE BREAKER (MCB,MCCB,ACB)
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
we must know load of perticular equipment.
For Ex. Our load in MVA is 50 MVA
Our system voltage(MCB,MCCB,ACB) is 440V.

I(Bre)= 50/(1.73x0.440)=65.6 =Approx 65KA.

Our load in MVA is 20 MVA
Our system voltage(MCB,MCCB,ACB) is 440V.

I(Bre)= 20/(1.73x0.440)=26.2 =Approx 25KA.
 
Is This Answer Correct ?    37 Yes 9 No
Jitesh Patel
 
Answer
# 2
it depend upon the value of current flows during short
circuit.
And the short circuit current depends upon the KVA rating of
transformer how supplies that particular load and transformer
percentage impedance.
 
Is This Answer Correct ?    35 Yes 8 No
Shan80
 
 
 
Answer
# 3
it depends on the short circuit & full load of equipment 
Is This Answer Correct ?    16 Yes 13 No
Ashok
 
Answer
# 4
we must know load of perticular equipment.
For Ex. Our load in MVA is 50 MVA
Our system voltage(MCB,MCCB,ACB) is 440V.

I(Bre)= 50/(1.73x0.440)=65.6 =Approx 65KA.

Our load in MVA is 20 MVA
Our system voltage(MCB,MCCB,ACB) is 440V.

I(Bre)= 20/(1.73x0.440)=26.2 =Approx 25KA.
 
Is This Answer Correct ?    4 Yes 4 No
Hrusikesh Dehury
 

 
 
 
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